Adsorption and diffusion of nitrogen and oxygen in natural mordenites

J. Valyon, G. Onyestyák, L. V.C. Rees

Research output: Contribution to journalArticle

1 Citation (Scopus)


Adsorbents made of mordenite-containing rocks from the Tokaj Mountains, Hungary (Mor-TM), and from Minase-Omori, Japan (Mor-MO) have been characterized by their equilibrium and dynamic adsorption properties for N2 and O2. The adsorbents are compared with a commercial synthetic 13X molecular sieve. Frequency-response (FR) sorption rate spectra have been determined at 133 Pa pressure in the temperature range of 195-298 K. These data suggest that diffusion in the meso- and macropores govern the rate of mass transport in particles larger than about 0.2-mm size. Mor-MO particles and synthetic zeolite 13X beads showed diffusivities, which are comparable and much higher than the corresponding diffusivities in particles of Mor-TM. Sorption was the slowest step of transport in particles smaller than about 60 μm. The FR data have been interpreted with respect to variations in the chemical and structural properties of the adsorbent samples.

Original languageEnglish
Pages (from-to)2078-2085
Number of pages8
JournalStudies in Surface Science and Catalysis
Volume154 B
Publication statusPublished - Dec 1 2004


  • Air separation
  • Frequency-response
  • Mass transport dynamics
  • Natural mordenite

ASJC Scopus subject areas

  • Catalysis
  • Condensed Matter Physics
  • Physical and Theoretical Chemistry
  • Surfaces, Coatings and Films
  • Materials Chemistry

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